Grinding-machine.



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A. B.-LANDIS. GRINDING MACHINE. APYLIOL'IIOR TILED AUG. 1", 1908. RENEWED DEG 11, 1011.

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GRINDING momma.

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UNITED s'rA'rEs PATENT OFFICE.

ABRAHAM B. LANDIS, OF WAYNESBORO, PENNSYLVANIA.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Feb. 20, 1912.

Application filed August 17, 1908, Serial No. 448,829. Renewed December 11, 1911. Serial No. 665,152.

To all whom it may concern:

Be it known that I, ABRAHAM B. LANDIB, a citizen of the United States residing at Waynesboro, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Grinding-Machines, of which the following is a specification.

My said invention consists in certain improvements in the details of construction of that class of grinding machines such as shown in my application No. 293,003, filed December 22, 1905, whereby the work-holding head-stock may be positively driven through a belt gear from a driving shaft of the machine while said head-stock is being traversed throughout its range of movement, during any swiveling movement of the table on which the head-stock is mounted, and any swiveling movement of the head-stock itself without varying the length of the belt, and other advantages secured, all as will be hereinafter more fully described and claimed.

Referring to the accompanying drawings which are made a part hereof, and on which similar reference characters indicate similar parts, Figure 1 is a perspective view of a grinding machine of the character named, embodylng my said improvements, Fig. 2, a top or plan View thereof, Fig. 3 a detail end view showing the partsto which my' invention especially relates, Fig. 4 a detail top or plan view of the head-stock on an enlarged scale, Fig. 5 a View looking in the direction indicated by the arrows from the dotted line 55 in Fig. 1 and F ig. 6 a vertical section on thedotted line 66 in F ig; 5.

In said drawings the portions marked A represent the main bed of the machine, B the carriage on which the work is mounted and C a housing in which part of the gearing is supported.

In most particulars the general structure of the machine is the same as shown and described in my application before mentioned, and need not be described in detail herein.

The frame A isa casting of suitable character for the urpose and has a to A which is of a bowl-shaped form, an has a central support carrym the bearings 3, 3, for the spindle on which the inding wheel 5 and pulley 6 are mounted. pulle 7 is alsomounted on' said shaft by whic' the spindle is geared by a belt, not shown,

extending through the machine, as shown and described in my said application, to a shaft in the lower part of the casing carrying the pulley 8 on its outer end, which is connecte by a belt 9 to a pulley 10 on the main shaft 1.

The front edge of the top A is formed straight and its rear edge is a segment of a circle having the axis of the part A for its center. It is provided with a way a on which the carriage B is adapted to traverse. The traversing mechanism is the same as illustrated in my said application 293,003 and need not therefore be further described herein. The carriage B is of suitable form mounted upon said way a geared to be automat-ically traversed back and forth, and has mounted thereon at one end the head-stock B and at the other end the foot-stock B for holding the work, said head-stock and foot-stock being adjust-ably secured on said carriage by means of a T-slot b and clamping bolts, as is usual, or any other approved manner.

The head-stock B comprises a suitable support or base with an upright standard having an overhanging arm 13 swiveled thereon in which is a bearing for the spindle b of the face-plate I). Said arm B has a split socket which surrounds the upright portion of said base B bein clamped thereon by a screw 6 which exten s throu h vaperforation in an ear on one side of t e split in said socket and into a screw-threaded perforation in a similar car on the other side, in the well known manner. A tapered pin 1) extends through the part B into a perforation in the part B, as shown in Fig. 6, in position to lock the part B to hold the face plate at a proper angle to the inding wheel. By withdrawing said pin 6 and backing the clamping screw 6 the art B 'will be free to swivel on the stan ard of part B and the face late with the work brought to any angle esired in relation to the rindin wheel, and there secured, as will e readily understood. Said face plate I) has a gear 15 on its, rear side, which meshes with a pinion 16 journaled on a stud shaft and in turn meshes with a pinion 17 on a shaft 18. Said shaft 18 has a miter-gear 19, which meshes. with a similar gear 20 on the to of the vertical shaft 21. Sai

vertical s aft 21 has a rope-drive pulley 22 on its lower end. Similar pulleys 23 and 24 are journaled on stud shafts 2,5 and 26 in the same plane with and to one side of the pulley 22. A similar pulley 27 is mounted on a stud shaft 28 on a bracket 29 on one side oft-he way a; mounted on the top A near the end of said way. Another pulley 39 is mounted on a stud shaft 30 near the Opposite end of the way a. The housing C is secured to the way a and has a pulley 31 at its inner end midway between pulleys 27 and 39, and two pulleys 32 and 83 mounted on a single shaft 3 1 in a frame 35 swiveled on a bolt 36 in the other end of said housing.

A driving pulley40 is mounted on the end of shaft 1, and an idler pulley 4:1 is mounted on a shaft carried in the outer end of an arm 42, loosely pivoted on said shaft 1. A belt 45 extends from said pulley 40 up over pulley 32, along to the pulley 27, around the outside of said pulley, back around the inner face of pulley 24, then around pulley 22 on the lower end of .shaft 25, back and around pulley 25, then from pulley 25 back around pulley 29, then forward and around pulley 31, then back over pulley 33 down and under idler pulley 41 and to said pulley 4:0. Said arm 42 is intended to be of suffi cient weight to serve as a tightener to take up the slack in said belt and keep it at suf ficient tension to enable it to perform its function. It will thus be seen that said shaft 21 is driven from shaft 1 by said belt, and face-plate b carrying the work is driven from said shaft 21 through the pinions 15, 16, 17, 19 and 20. As carriage B' traverses back and forth it will be seen that the belt will be maintained at even tension by reason of pulleys 27 29 and 31, maintaining a uniform length of belt required to pass over the parts, as described, from the pulley l0 on the driving shaft 1 to the pulley 22 on the vertical shaft 21 in the head-stock.

On the circular rear part of the edge of the top A I have formed a series of graduation marks as will be seen by reference to Fig. 2, and have mounted a pointer arm A on the swiveled frame carrying the grinding wheel, which pointer arm is formed with an edge .at its outer end adapted to rest upon the edge of said bowl-shapedtop'. Said pointer arm is mounted on'horizontal pivots so that it will accommodate itself to any vertical adjustment of said frame and rest on said edge at all times. By this means the operator is able to set a grinding-wheel spindle at the angle necessary to present the grinding wheel to the work at the angle desired.

Having thus fully described my said in vention what I claim to secure as new by Letters Patent is:

1. In a grinding machine, the combination of the frame, a driving shaft, a traversing carriage carrying the head-stock, said head stock, gearing for driving the faceplate of said head-stock connected to the driving shaft of the machine by means of a belt which passes over a pulley on said main driving shaft, over idler pulleys on fixed supports near each end of the frame, over another idler pulley on a fixed intermediate support and over a pulley on a shaft geared to said face-plate, substantially as set forth.

2. In a grinding machine, the combination of the frame, the grinding mechanism, a carriage, a headstock and a foot-stock on said carriage, means for driving the workholding spindle of said head-stock comprising gearing connected'to the driving shaft of the machine by means of a belt, and said belt passing over a pulley on said driving shaft, over a stationary pulley on the machine near one end thereof, over another pulley near the other end of the machine, around a pulley on the driving shaft in said head-stock, back to the opposite end of the machine, then around another stationary pulley, then back to an intermediate point between said stationary pulleys, and then around another stationary pulley, then back to the end of machine and down to the pulley on said driving shaft, substantially set forth. 7

3. In a grinding machine, the combination, of a frame having a carriage way, a traversing carriage on said way, a movable headstock comprising a swiveled face-plate thereon, gearing for driving said face-plate .connected to a driving shaft of the machine by a belt mounted on intermediate idler pulleys arranged to take up the length of said belt while said carriage and face-plate move in operation, substantially as set forth.

In witness whereof, I have hereuntoset my hand and seal at Waynesboro, Pa, this 28th day of July, A. D. nineteen hundred and eight.

ABRAHAM B. LANDIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

